For the impulse to transfer from presynaptic to post-synaptic neuron, the substance required is:
Correct answer: D. Calcium
- A. Sodium
- B. Potassium
- C. Protein
- D. Calcium
Explanation
Calcium ions (Ca2+) are required for the transfer of impulses from the presynaptic neuron to the postsynaptic neuron. When an action potential reaches the presynaptic terminal, it triggers the opening of voltage-gated calcium channels. The influx of calcium ions into the presynaptic terminal leads to the release of neurotransmitter molecules from vesicles into the synaptic cleft. These neurotransmitters then bind to receptors on the postsynaptic membrane, transmitting the impulse from one neuron to another.
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About Coordination and Control
Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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